CN201163781Y

CN201163781Y - Industrial Ethernet switchboard based on DRP protocol

Info

Publication number: CN201163781Y
Application number: CNU2007200775195U
Authority: CN
Inventors: 包伟华; 张庆军
Original assignee: Shanghai Automation Instrumentation Co Ltd
Current assignee: Shanghai Automation Instrumentation Co Ltd
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2008-12-10
Anticipated expiration: 2017-12-28

Abstract

The utility model discloses an industrial Ethernet exchanger based on the DRP protocol, comprising an Ethernet interface, an isolation module, an exchanger processing unit module, an electrostatic prevention lighting protection module and a power source module. The exchange is characterized in that the exchanger comprises a CPU control management module which is connected with the exchanger processing unit module. Link detection messages, link warning messages and equipment statement messages are processed by the CPU control management module. A communication link fault of any exchanger can be quickly found and correspondingly processed by using a ring net formed by the industrial Ethernet exchanger unit. The communication of other equipment of the whole system is not impacted. The performance of the industrial Ethernet exchanger unit is apparently better than that of the normal Ethernet exchanger. A high usability combined ring net of the industrial Ethernet is realized.

Description

Industrial Ethernet switch based on the DRP agreement

Technical field

The utility model belongs to network switching equipment technical field, is specifically related to a kind of Industrial Ethernet switch based on the DRP agreement.

Background technology

Ethernet technology since have opening, stability, with low cost, transmission rate is high, be easy to plurality of advantages such as networking, progress into industrial control field, becoming the part of automated communication network, is exactly Ethernet switch and use the present the most frequently used equipment of Ethernet.Adopting the network recovery time of the common commercial Ethernet switch of STP (generating tree) agreement and RSTP (rapid spanning-tree) agreement is 2 seconds to 20 seconds, can not satisfy the requirement of industrial control network real-time communication,

The utility model content

The utility model technical issues that need to address are to realize the Industrial Ethernet switch of a kind of DRP of support agreement (DistributedRedunancy Protocol), can form looped network, and be implemented in communication redundancy in the loop network, can detect link failure and equipment fault in the looped network apace, and can set up new network and open up to mend and recover network.

For solving the problems of the technologies described above; the technical solution adopted in the utility model is: based on the Industrial Ethernet switch of DRP agreement; comprise Ethernet interface, isolation module, switch processing unit module, antistatic lightning strike protection module and power module; it is characterized in that: also comprise the CPU control management module, described CPU control management module is connected with described switch processing unit module.

Described CPU control management module can be connected with spi bus by Ethernet interface with described switch processing unit module,

Described CPU control management module is made up of ARM microprocessor chip AT91SAM7x256 and peripheral circuit thereof.

Described CPU control management module is made up of KS8995MAI chip and peripheral circuit thereof.

It has particular application as: the Industrial Ethernet switch based on the DRP agreement is formed a loop network, wherein every switch has 2 ports to be connected on the looped network, and be referred to as the central port, there is two states the central port, be respectively blocked state and forwarding state, the port that is in forwarding state is transmitted all Ethernet messages, and the port that is in blocked state is only transmitted the DRP protocol massages.Each switch carries out clock synchronization according to IEEE 1588 agreements, and by this synchronous, the clock between the switch can be realized the synchronous of the wonderful level of sub-micro.Network enters stage of communication afterwards, and each switch also will send DRP protocol massages, i.e. device asserts message and link detection message (LinkCheck) according to the configuration timesharing except exchanging common network data message.Whether the device asserts message is used to detect looped network closed, and link detection message is used for whether having link failure or equipment fault between the detection ring l network neighbouring device.Each equipment all sends link detection message to adjacent switch simultaneously in its communication cycle.If network is normal, in the regular hour, switch device can receive the detection messages that neighbouring device sends so.If have switch device in the time that limits, not receive the detection messages that neighbouring device sends, show that then network breaks down.The switch device of finding network failure this moment sends link warning message (LinkAlarm) to whole network, and enables communication path standby in the looped network, guarantees the operate as normal of network.

The utility model has the advantages that: use according to the method described above, can fast detecting locate and repair network failure, the communication link fails of any one switch can be found and obtain respective handling fast, can not influence the communication of other equipment in the whole system, avoid in master-slave mode, the token formula Control on Communication mode because the fault of the whole system that the fault of main website or token main website causes communication.The network recovery time of the looped network that the Industrial Ethernet switch of 50 employing DRP agreements is formed is 100 milliseconds, obviously is better than common Ethernet switch on performance, has realized that the high availability of Industrial Ethernet is formed looped network.

Description of drawings

Fig. 1 is a DRP Industrial Ethernet exchange hardware block diagram;

Fig. 2 is a DRP Industrial Ethernet exchanger power modular structure;

Fig. 3 is the loop network structural representation;

Fig. 4 is a DRP Industrial Ethernet switch software workflow.

Among the figure: isolation module 1, exchange processing capacity module 2, CPU control management module 3, antistatic lightning strike protection module 4 and power module 5.

Embodiment

Below in conjunction with accompanying drawing and specific implementation method the utility model is described in further detail:

As seen from Figure 1: DRP Industrial Ethernet switch of the present utility model comprises Ethernet interface, isolation module 1, exchange processing capacity module 2, CPU control management module 3, antistatic lightning strike protection module 4 and power module 5; The Ethernet message that the RJ45 port receives sends exchange processing capacity module 2 to through isolation module 1.The main effect of isolation module 1 is filtering, suppresses to disturb and the circuit isolation.Exchange processing capacity module 2 mainly is made up of KS8995MAI chip and peripheral circuit thereof.KS8995MAI is a high-performance technical grade chips of Ethernet exchange, it is integrated physical layer transceiver, MAC unit and sram cache.Ethernet physical layer provides 5 independently Ethernet physical interfaces, compatible 802.3 10base-T, and 100BASE-TX wherein has two ports also to support 100BASE-FX.Have speed auto-negotiation mechanism, realize the automatic selection of 10M/100M and half-duplex/full-duplex mode.The exchange processing capacity module 2 main packets of being responsible between each port are transmitted.After the Ethernet message was delivered to exchange processing capacity module 2, exchange processing capacity module 2 was transmitted to corresponding ports according to message address.The normal service message of switch will be transmitted from two central ports, and the message of DRP agreement (comprising device asserts message, link detection message, link warning message) can change CPU control management module 3 over to and handles.

CPU control management module 3 mainly is made up of ARM microprocessor chip AT91SAM7x256 and peripheral circuit thereof.AT91SAM7X256 is based on the Series of MCU of 32 ARM risc processors, be integrated with the high speed Flash of 256 bytes and the SRAM of 64 bytes, and a series of ancillary equipment that comprise USART, SPI, CAN controller, Ethernet network interface, timer/counter, RTT and analog to digital converter.Be connected with spi bus by Ethernet interface between CPU control management module 3 and the exchange processing capacity module 2, mainly exchange chip realized register setting and network data read-write capability, be used for the processing that the DRP agreement is unpacked and packs.When exchange processing capacity module 2 is received the DRP protocol massages, message is given to the Ethernet interface of CPU control management module 3, CPU is to the message that receives and make corresponding analyzing and processing, and can change the setting of exchange chip register by spi bus, thereby changes the state of Switching Module port.

4 pairs of holding wires of antistatic lightning strike protection module, power line etc. have been taked safeguard measure, anti-lightning strike diode, TVS pipe, and the heavy current that produces when preventing static or thunderbolt enters system along various lines.

As seen from Figure 2: behind the 24V DC power supply process rectifying and wave-filtering of power module with the redundant input of two-way, selecting one road power supply by voltage ratio mode is power supply for exchange.The output of power module is converted to the operating voltage that chip circuit provides 3.3V, 2.5V and 1.8V by DC-DC on the one hand, realizes the PoE power supply by Ethernet interface on the other hand.

As seen from Figure 3: the loop network port that the DRP switch is formed has forwarding state F (Forwarding) and blocked state B (Blocked), and the port that is in blocked state B is only transmitted the message of DRP, and the port that is in forwarding state F is transmitted all messages.The status equal role of each switch device in communication has only a port to be in blocked state B in the looped network under the normal condition, all the other ports are in forwarding state F.

As seen from Figure 4: under the software workflow of DRP agreement Industrial Ethernet switch: switch is after initial configuration and clock synchronization are finished, to carry out time offset based on the grand time started in cycle of same communication calculates, when the device asserts message time arrives, with the two-way transmitting apparatus assert packet of multicast address, if transmit leg is received the device asserts message that oneself sends, think that then looped network is closed; When the link detection message time arrives, send link detection message, the LinkCheck message transmitting time of all devices is identical in the communication network, and when the time-domain of LinkCheck message arrived, all devices sent the LinkCheck message simultaneously.The LinkCheck message adopts the two-way transmission of multicast address, has comprised the transmit leg MAC Address in the message, multicast address, ServiceID, parameter informations such as DeviceID.Under the network normal condition, before all can reaching overtime, each equipment receives the LinkCheck message that sends by neighbouring device.When certain port of certain equipment when the time-out time of LinkCheck message arrives, still do not receive and be attached thereto the LinkCheck message that port sends, at first detect whether the LinkDown sign is arranged, if the LinkDown sign is arranged, then judge and link failure occurs with being connected of this port, if no, judge that then neighboring switch CPU breaks down.This equipment will adopt the two-way transmission LinkAlarm of multicast address message, and the state of the port that will be connected with faulty link is changed into blocked state.

Comprised the transmit leg MAC Address in the LinkAlarm message, multicast address, ServiceID, parameter informations such as DeviceID.After other equipment is received the LinkAlarm message in the network,, then change port status into forwarding state, empty FDB (Filtering Database) table simultaneously, carry out path learning again, set up new network and open up benefit if ports having is in blocked state.

Below the principle of utilizing Ethernet switch realization network recovery of the present utility model is done following description:

In loop network,, enter communications status based on the Industrial Ethernet switch process initialization of DRP agreement and based on after the IEEE1588 agreement realization exact time synchronization.Each equipment is according to configuration, and timesharing transmitting apparatus assert packet and link detection message exchange common Ethernet message simultaneously.Link detection message adopts the two-way transmission of multicast address, when if certain port of certain equipment arrives at the time-out time of link detection message, still do not receive the link detection message of the port that is attached thereto, then determine existing network network fault, need change the central port of oneself into blocked state by forwarding state, adopt the two-way transmission link of multicast address warning message to report to the police simultaneously.After miscellaneous equipment is received the link warning message in the looped network, change forwarding state into, empty the FDB table simultaneously, carry out path learning again if the central port is in blocked state.To use backup link in the looped network like this, realize the fast quick-recovery of network, guarantee the availability of network.

Claims

1. based on the Industrial Ethernet switch of DRP agreement; comprise Ethernet interface, isolation module, switch processing unit module, antistatic lightning strike protection module and power module; it is characterized in that: also comprise the CPU control management module, described CPU control management module is connected with described switch processing unit module.

2. the Industrial Ethernet switch based on the DRP agreement according to claim 1 is characterized in that: described CPU control management module is connected with spi bus by Ethernet interface with described switch processing unit module,

3. the Industrial Ethernet switch based on the DRP agreement according to claim 1 is characterized in that: described CPU control management module is made up of ARM microprocessor chip AT91SAM7x256 and peripheral circuit thereof.

4. the Industrial Ethernet switch based on the DRP agreement according to claim 1 is characterized in that: described CPU control management module is made up of KS8995MAI chip and peripheral circuit thereof.